Page 438 - 2018_IRC

ROOF-CEILING CONSTRUCTION

R804.2 Structural framing. Load-bearing, cold-formed steel minimum flange width of 1.625 inches (41 mm) and a
roof framing members shall be in accordance with this section. maximum flange width of 2 inches (51 mm). The mini-
1
mum lip size for C-shaped sections shall be / inch (12.7
R804.2.1 Material. Load-bearing, cold-formed steel 2
framing members shall be cold formed to shape from mm). Tracks shall comply with Figure R804.2.3(2) and
1
structural quality sheet steel complying with the require- shall have a minimum flange width of 1 / inches (32 mm).
4
ments of ASTM A1003, Structural Grades 33 Type H and Minimum Grade 33 ksi steel shall be used wherever 33
50 Type H. mil and 43 mil thicknesses are specified. Minimum Grade
50 ksi steel shall be used wherever 54 and 68 mil thick-
R804.2.2 Corrosion protection. Load-bearing, cold- nesses are specified.
formed steel framing shall have a metallic coating comply- R804.2.4 Identification. Load-bearing, cold-formed steel
ing with ASTM A1003 and one of the following:
framing members shall have a legible label, stencil, stamp
1. Not less than G 60 in accordance with ASTM A653. or embossment with the following information as a mini-
2. Not less than AZ 50 in accordance with ASTM A792. mum:
R804.2.3 Dimension, thickness and material grade. 1. Manufacturer’s identification.
Load-bearing, cold-formed steel roof framing members 2. Minimum base steel thickness in inches (mm).
shall comply with Figure R804.2.3(1) and with the dimen- 3. Minimum coating designation.
sional and thickness requirements specified in Table
R804.2.3. Additionally, C-shaped sections shall have a 4. Minimum yield strength, in kips per square inch
(ksi) (MPa).

TABLE R804.2.3
LOAD-BEARING COLD-FORMED STEEL ROOF FRAMING MEMBER SIZES AND THICKNESSES
MEMBER WEB DEPTH MINIMUM BASE STEEL THICKNESS
DESIGNATION a (inches) mil (inches)
350S162-t 3.5 33 (0.0329), 43 (0.0428), 54 (0.0538)
550S162-t 5.5 33 (0.0329), 43 (0.0428), 54 (0.0538), 68 (0.0677)
800S162-t 8 33 (0.0329), 43 (0.0428), 54 (0.0538), 68 (0.0677)
1000S162-t 10 43 (0.0428), 54 (0.0538), 68 (0.0677)
1200S162-t 12 43 (0.0428), 54 (0.0538), 68 (0.0677)
For SI: 1 inch = 25.4 mm
a. The member designation is defined by the first number representing the member depth in hundredths of an inch, the letter “s” representing a stud or joist
member, the second number representing the flange width in hundredths of an inch and the letter “t” shall be a number representing the minimum base metal
thickness in mils.

FLANGE
FLANGE

WEB

SIZE OF TRACK
(INSIDE TO INSIDE)
DEPTH OF WEB LIP
(OUTSIDE TO
OUTSIDE)

WEB
FIGURE R804.2.3(1) FIGURE R804.2.3(2)
C-SHAPED SECTION TRACK SECTION

2018 INTERNATIONAL RESIDENTIAL CODE ® 413
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.